CGSC379 Lecture Notes - Lecture 4: Sedation, Field Recording, Conductive Hearing Loss
10 Aug 2018
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Physiological testing: physiological tests, do not require a voluntary response from the patient, can help pinpoint the site of dysfunction, site of lesion, are used as cross checks to verify or validate other test results, particularly useful for. Infants/toddlers: personals with developmental disabilities, site of lesion testing, 3 types. Afferent and efferent systems: can help make some assumptions about hearing status, acoustic reflex threshold, lowest level that elicits contraction, 70-100 db spl, used to diagnose retrocochlear pathologies, differences in ipsilateral and contralateral, sound (40% ipsilateral, 60% contralateral) Impacted by movement, talking, crying, noise: late potential= central system, endogenous, resistant to movement, noise, etc. Infants <4 months can be tested unsedated: primarily early potentials (cochlea and viii nerve, late potential testing must be unsedated, often used in (c) apd testing, uses, estimate hearing loss levels. Iii (3. 5-4. 3 msec: v (5. 0-6. 1 msec, latencies tend to get longer as db nhl decreases, sound gets softer closer to thresholds, called latency-intensity function.
